JP2614640B2 - Memory card - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory card containing one or more semiconductor memory elements called, for example, an IC memory card and the like, and in particular, to the storage of the memory card. It is about structure.

[Conventional technology]

2. Description of the Related Art Conventionally, a memory card has been used in, for example, a work processor, a handheld computer, an information collection device, or an electronic device for data files. Various external shapes of memory cards have been commercialized according to the use form, but with the progress of semiconductor manufacturing technology, the size and thickness of memory cards have tended to become smaller and thinner in recent years.

FIG. 8 is an exploded perspective view of a conventional memory card.
As shown in FIG. 1, a conventional memory card includes a printed circuit board 102 having a semiconductor element 101 mounted on one side, a connector 103 connected to the printed circuit board 102, a frame 108 made of synthetic resin, and an upper nameplate 106. And a lower nameplate 107.

When the storage capacity is small, in other words, when the number of semiconductor elements to be mounted is small, the semiconductor element may be mounted on one side of the printed circuit board.

However, in order to increase the storage capacity, in other words, to increase the number of semiconductor elements to be mounted, it is necessary to mount the semiconductor elements on both sides of the printed circuit board, which is not possible with the structure shown in FIG. Appropriate.

Conventionally, a memory card as shown in FIG. 9 has been known as a structure capable of storing a printed circuit board having semiconductor elements mounted on both sides.

As shown in FIG. 1, a connector 103 is connected to one end of a printed circuit board 102 on which semiconductor elements 101 are mounted on both sides. The connector 103 and the other end of the printed circuit board 102 are sandwiched between an upper case half 104 and a lower case half 105 in a sandwich shape, and the two case halves 104 and 105 are connected by appropriate means. The printed circuit board 102 is housed in the case halves 104 and 105. Upper case half 104
An upper nameplate 106 is fixed to the upper surface of the first case, and a lower nameplate 107 is fixed to the lower surface of the lower case half 105, respectively.

[Problems to be solved by the invention]

By the way, in the structure shown in FIG.
Top and bottom of 104 and 105 are upper nameplate 106 and lower nameplate
Almost covered by 107, but both case halves 10
Both sides are visible from the outside.

Therefore, high molding accuracy is required for both of the case halves 104 and 105, and the production cost of both dies for molding them is high, which eventually leads to an increase in the cost of the memory card.

Further, when the two case halves 104 and 105 are overlapped and connected to each other, if there is a misalignment between them, a step is formed at the joint of the two case halves 104 and 105 to be conspicuous, thereby reducing the commercial value. In order to prevent such a step from occurring, it is necessary to provide, for example, a pin and a positioning engaging portion such as a concave portion into which the pin is inserted at the joint between the two case halves 104 and 105, and a memory card. It is not preferable because it hinders miniaturization and thinning of the device.

An object of the present invention is to provide a low-cost memory card which can solve the above-mentioned drawbacks of the prior art, can be made thinner, and does not reduce its commercial value.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention has a circuit element mounted on both sides in a housing portion of a first frame such as an upper frame having a frame portion and a housing portion provided inside the frame portion. Printed circuit board and second frame such as lower frame
And the second frame is engaged with the frame of the first frame.

Then, with the printed circuit board held between the first frame and the second frame, the first frame and the second frame are integrally connected by, for example, screwing.
Further, at least an outer surface of the second frame that is not covered by the first frame is provided with a cover member such as a lower nameplate or a battery cover.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a block body, FIG. 2 is a partially enlarged sectional view for explaining an engagement structure between an upper frame and a lower frame of the block body, FIG. 3 is a perspective view of a lower frame,
FIG. 4 is a perspective view showing a state where an upper nameplate is attached to the block body, FIG. 5 is a perspective view showing a state where a lower nameplate is attached to the block body, and FIG. 6 is a perspective view showing a state where a battery lid is attached to the block body. FIG. 7 is an enlarged sectional view of the memory card.

The memory card according to this embodiment is roughly composed of a block body 1, an upper nameplate 2, a lower nameplate 3, and a battery cover 4.

As shown in FIG. 1, the block body 1 includes an upper frame 5, a printed circuit board 6, a connector 7, and a lower frame 8.
It is composed of Note that FIG. 1 and FIG.
The drawing shows the upper frame 5 downward and the lower frame 8
Is drawn up.

The upper frame 5 has a rectangular frame portion 9, and the inside of the frame portion 9 includes the printed circuit board 6 and the lower frame 8.
A concave portion is formed so as to be able to accommodate the same, and a reinforcing rib 10 extending in the longitudinal direction is provided at a predetermined interval at a position corresponding to the top of the concave portion. A connector positioning concave portion 11 is provided at the front end of the frame portion 9, and an erroneous insertion preventing groove 12 is provided at both front sides of the frame portion 9 so that the memory card can be correctly inserted into a reader / writer. However, a concave / convex portion 13 for finger hooking is formed on both sides of the frame portion 9 and on the rear end side.

At four inner corners of the frame portion 9, screw insertion portions 14 are provided.
As shown in FIG. 2 and FIG. 2, insertion grooves 36 are formed on both sides of the frame portion 9 over substantially the entire length thereof.

A large number of circuit elements 16 such as semiconductor memory elements and gate arrays are mounted on both sides of the printed circuit board 6, and the memory card of this embodiment has a storage capacity of 1 megabyte. As shown in FIG. 4, the circuit elements 16 mounted on the upper surface of the printed circuit board 6 are entirely aligned, and when the printed circuit board 6 is accommodated in the upper frame 5,
The reinforcing ribs 10 of the upper frame 5 are inserted into the gaps of 16 rows,
The upper surface of the upper frame 5 and the upper surface of each circuit element 16 are flush.

A connector 7 is integrally connected to the front end of the printed circuit board 6, and an insulating sheet 17 is connected to the rear end of the printed circuit board 6.
And battery terminals 18 paired with each other are attached. A battery (not shown) connected to the terminal 18 is a backup power supply, and two batteries are arranged in parallel so that the battery can be backed up for a long time even when a commercial power supply is interrupted, for example. As this back-up battery, a button-type battery such as a lithium battery is used, for example. At four corners of the printed circuit board 6, cutouts 19 through which screws are inserted are formed.

Screw holes 20 are provided at the four corners of the lower frame 8, and a battery holder 21 is integrally formed at the rear end. As described above, since the battery terminals 18 are provided in pairs substantially at the center on the rear end side of the printed circuit board 6, the batteries are arranged on both sides of the terminals 18. In addition, since a battery having as large a discharge capacity as possible, in other words, a battery having a large external shape, is used, the battery insertion portion of the battery holding portion 21 necessarily moves to both sides of the lower frame 8. for that reason,
Both ends of the battery holder 21 are cut off as shown in the figure, and a tapered projection 22 is formed in a part of each battery holder 21.

As will be described later, the lower frame 8 is
When the four corners are integrally fastened to the upper frame 5 with the screws 23, there is a concern that the protruding portion 22 of the lower frame 8 may protrude downward from the edge of the upper frame 5 if it is slightly. Therefore, in this embodiment, as shown in FIGS. 1 and 2, an engaging claw 24 is provided on the side surface of the protruding portion 22, and a position of the frame 9 of the upper frame 5 facing the engaging claw 24 is provided. An engagement step 25 is formed. Therefore, as shown in FIG.
When the upper frame 5 and the lower frame 8 are overlapped with each other via the printed circuit board 6, the engagement claws 24 are engaged with the engagement step portions 25 and are stopped, so that the projections 22 project from the lower surface of the upper case 5. There is nothing to do.

Further, by the engagement between the engagement claws 24 and the engagement step portions 25, the upper frame 5 and the lower frame 8 are temporarily fixed integrally via the printed circuit board 6. Therefore, various tests are performed on the printed circuit board 6 on which the circuit element 16 is mounted in the state of the semi-finished product.
The temporary fixing described above can be removed and replaced easily. Further, since the temporary fixing is performed in this manner, the efficiency of productivity can be improved because the next screw fastening operation is simple and the like.

A portion of the lower frame 8 on the front side of the battery holding portion 21 is a cover portion 26 for covering the various circuit elements 16 (however, the position facing the circuit element 16 where the total height is high is the escape position as shown in the figure. Holes are formed). This cover part 26
A spring insertion hole 27 is formed in the printed circuit board 6 at a position facing a ground conductive portion (not shown).
Also, the battery holder 21 and the cover are located on the lower surface of the lower frame 8.
At the border with 26, a ridge 28 is provided to hold the battery
And the cover part 26.

As shown in FIG. 3, a reinforcing rib 29 facing the reinforcing rib 10 of the upper frame 5 is integrally provided on the upper surface of the lower frame 8. Numeral 30 in the drawing is a fixing adhesive tape, which serves to prevent the nut 31 inserted into the lower frame 8 from coming off.

As shown in FIG. 1, the printed circuit board 6 to which the connector 7 is connected is inserted into the frame 9 of the upper frame 5. Although not shown, a double-sided adhesive tape is affixed to the lower surface of the connector 7 in the state of FIG. 1, and the connector 7 is positioned by inserting the connector 7 into the connector positioning recess 11 of the upper frame 5. Is fixed.

Next, the lower frame 8 is placed on the printed circuit board 6, and the engaging claws 24 of the lower frame 8 are engaged with the engaging steps 25 of the upper frame 5 as described above, so that The upper frame 5 and the lower frame 8 are temporarily fixed. Engagement claw 24
With the engagement step 25 engaged with the screw 23 and the nut 32
, The upper frame 5 and the lower frame 8 are integrally connected with the printed board 6 and the connector 7 interposed therebetween. This state is shown in FIG. 5, in which the printed board 6 and the lower frame 8 are accommodated in the upper frame 5, and the assembly of the block body 1 is completed. By connecting the upper frame 5 and the lower frame 8 as described above, the printed board 6 is moved upward by the reinforcing ribs 10 of the upper frame 5 and the reinforcing ribs 29 of the lower frame 8 as shown in FIG. , The double-sided printed circuit board 6 is protected from below.

As shown in FIG. 5, the spring insertion hole 27 of the lower frame 8 is provided.
A conductive coil spring 33 is inserted into the lower frame 8, and the lower plate 3 made of metal having substantially the same area as the cover 26 of the lower frame 8 is covered from above. Although not shown, a hot-melt adhesive is applied to the inner surface of the lower name plate 3 except for the adhesive non-formed portion 34 indicated by a broken line. Also, at both ends of the lower nameplate 3, a bent portion 35 bent inward at a right angle is provided.
The bent portion 35 is inserted into the insertion groove 36 (see FIG. 1) of the upper frame 5 when the lower name plate 3 is placed on the lower frame 8 (see FIG. 7). Thus, the bent portion 35 is provided at the side end of the lower name plate 3 and
According to the structure inserted in 36, even if the lower nameplate 3 is warped for some reason, only the position of the bent portion 35 in the insertion groove 36 is shifted, so that the lower nameplate 3 and the upper frame 5 Since the gap between them is not visible, a decrease in the commercial value can be avoided.

By hot pressing from above the placed lower nameplate 3,
The hot melt-based adhesive is melted, and the contact surface between the lower nameplate 3 and the lower frame 5 (cover portion 26) and the lower nameplate 3
The contact surface between the upper frame 5 and the upper frame 5 is bonded (see FIG. 7). As described above, the adhesive-free portion 34 is formed on the lower nameplate 3, so that the lower surface of the printed circuit board 6 can be grounded via the coil spring 33 and the lower nameplate 3.

As shown in FIG. 1 and FIG. 5, switch operation ports 37a and 37b are opened at corresponding positions of the lower frame 8 and the lower nameplate 3, respectively. As shown in FIG. 1, an erroneous erasure prevention switch 38 is mounted on the printed circuit board 6. By assembling a memory card as shown in FIG. 6, the erroneous erasure prevention switch 38 is connected to the switch operation port 37a. , 37b so that it can be operated from outside.

After the lower nameplate 3 is fixed to the block body 1 as described above, the battery cover 4 is rotatably mounted on the lower frame 8 as shown in FIG.
A button-type battery (not shown) is stored in each of them.

As shown in FIG. 4, a spring insertion hole 39 is formed in a portion of the upper frame 5 at a position corresponding to the upper surface side ground conductive portion (not shown) of the printed board 6, and a conductive coil spring 40 is formed therein. Is inserted. A hot-melt type binder is applied to the inner surface of the upper name plate 2 except for the adhesive non-forming portion 41 formed at a position corresponding to the spring insertion hole 39. By mounting the nameplate 2 and hot pressing, the upper nameplate 2 is integrally bonded to the frame portion 9 of the upper frame 5, the reinforcing ribs 10, and the circuit elements 16 as shown in FIG.

The upper surface of the printed circuit board 6 is grounded via the coil spring 40 and the upper nameplate 2. In addition,
Desired designs and trade names are printed on the nameplates 2 and 3. With the structure as in this embodiment, the total height is about 5 mm
Memory card can be manufactured.

In the above-described embodiment, the name plate of the metal plate is used as the cover member that covers the outer surfaces of the upper frame and the lower frame. However, the present invention is not limited to this, and the ground of the printed circuit board incorporated by the cover member is used. In this case, a plastic sheet having conductivity can be used. When it is not necessary to ground the printed circuit board, a cover member such as a normal plastic sheet or paper may be used.

In the above embodiment, the cover member is provided on both the upper frame (first frame) and the lower frame (second frame). However, the upper frame (first frame) covering the outer surface of the lower frame (second frame) is provided. Since the outer frame is originally formed with high accuracy because the outer surface is exposed to the outside, the upper frame (the first frame) covers the entire upper surface of the printed circuit board by omitting the cover member. The cover member can be attached only to the lower frame (second frame).

Further, in the above embodiment, the upper frame (first frame)
Although the lower frame (second frame) and the lower frame (second frame) are connected by screws and nuts, they may be connected by other appropriate means such as ultrasonic bonding.

〔The invention's effect〕

Since the present invention is configured as described above, the second frame is covered with the first frame and the cover member, so that only the first frame is manufactured with higher accuracy and the second frame is formed. In this case, the accuracy can be lowered as compared with the first frame, so that the mold can be manufactured at low cost and the cost can be reduced.

Also, since the joint between the first frame and the second frame does not appear on the outer surface of the memory card, a step due to positional displacement between the frames does not appear on the outer surface as in the related art, and there is a fear of poor appearance. There is no.

Further, a printed circuit board and a second
This structure allows the memory card to be made thinner.

[Brief description of the drawings]

1 to 7 are views for explaining a memory card according to an embodiment of the present invention. FIG. 1 is an exploded perspective view of a block body, and FIG. 2 is an upper frame and a lower frame of the block body. FIG. 3 is a perspective view of a lower frame, FIG. 4 is a perspective view showing a state in which an upper nameplate is attached to a block body, and FIG. 6 is a lower view of the block body. FIG. 6 is a perspective view showing a state in which a nameplate is attached, FIG. 6 is a perspective view showing a state in which a battery cover is attached to a block body, and FIG. 7 is a sectional view of a memory card. 8 and 9 are an exploded perspective view and a sectional view of a conventional memory card. 1 ... block, 2 ... upper nameplate, 3 ... lower nameplate, 4 ...
... battery lid, 5 ... upper frame, 6 ... printed circuit board, 7
…… Connector, 8 …… Bottom frame, 9 …… Frame part, 10 ……
Reinforcing rib, 16 Circuit element, 23 Screw, 24 Engagement claw, 25 Engagement step, 29 Reinforcement rib, 32 Nut
33: Coil spring, 35: Bent part, 36: Insertion groove, 40: Coil spring.

Claims (6)

(57) [Claims] 1. A printed circuit board on which circuit elements are mounted on both sides and a second frame are inserted into an accommodation portion of a first frame having a frame portion and an accommodation portion provided inside the frame portion. The second frame is engaged with the frame portion of the first frame, and the first frame and the second frame are integrated with the first frame and the second frame sandwiching the printed circuit board. And a cover member provided on at least an outer surface of the second frame that is not covered by the first frame. 2. The memory card according to claim 1, wherein said cover member has conductivity and is electrically connected to a ground conductive portion provided on said printed circuit board. 3. The memory card according to claim 1, wherein said cover member is made of a metal plate. 4. The memory card according to claim 1, wherein a part of said cover member also serves as a battery cover. 5. The method according to claim 1, wherein reinforcing ribs are provided on the inner surfaces of the first frame and the second frame, respectively, and the printed board is held between the reinforcing ribs. Memory card to do. 6. The memory card according to claim 1, wherein said second frame and said cover member are integrally connected by bonding.